EP4000924A1 - Polyethylenfolienstrukturen für sicherere feinschrumpffolien - Google Patents

Polyethylenfolienstrukturen für sicherere feinschrumpffolien Download PDF

Info

Publication number
EP4000924A1
EP4000924A1 EP20208648.4A EP20208648A EP4000924A1 EP 4000924 A1 EP4000924 A1 EP 4000924A1 EP 20208648 A EP20208648 A EP 20208648A EP 4000924 A1 EP4000924 A1 EP 4000924A1
Authority
EP
European Patent Office
Prior art keywords
film structure
ethylene
terpolymer
layered film
structure according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20208648.4A
Other languages
English (en)
French (fr)
Inventor
Chantal SEMAAN
Antonios GITSAS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Abu Dhabi Polymers Co Ltd Borouge LLC
Borealis AG
Original Assignee
Abu Dhabi Polymers Co Ltd Borouge LLC
Borealis AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abu Dhabi Polymers Co Ltd Borouge LLC, Borealis AG filed Critical Abu Dhabi Polymers Co Ltd Borouge LLC
Priority to EP20208648.4A priority Critical patent/EP4000924A1/de
Priority to CN202180088704.7A priority patent/CN116710280A/zh
Priority to IL303039A priority patent/IL303039A/en
Priority to PCT/EP2021/082082 priority patent/WO2022106507A1/en
Priority to TW110142915A priority patent/TW202241711A/zh
Publication of EP4000924A1 publication Critical patent/EP4000924A1/de
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/58—Cuttability
    • B32B2307/581—Resistant to cut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Definitions

  • the present invention relates to a layered film structure comprising a core layer and external layers, to a process for producing a layered film structure by coextrusion of the layers, to a collation shrink film comprising the layered film structure, and to the use of the collation shrink film for wrapping of articles.
  • Collation shrink films are films structures that are wrapped around an object to be packaged and shrunk to keep the units within the object together.
  • the basic principle of collation shrink is to over-wrap a number of items in a loose film "sleeve" and then pass the wrapped goods through a heated shrink tunnel/oven to cause the collation shrink wrapping to occur.
  • the film collapses around the multiple items and holds them in place.
  • the most common use of these films is in the packaging of multiple containers (items), such as bottles or cans which might contain food, beverages and so on.
  • the collation shrink film is wrapped around a number of the containers, for example a 6-pack of drinks or 24-pack of food cans, optionally held in a cardboard tray or pad, and shrunk around the containers.
  • a film structure needs to have a specific combination of properties: First and foremost, the film structure must show a good shrinkage behaviour in order to hold the wrapped goods tightly. Furthermore, suitable film structures need to have good mechanical properties such as high stiffness, especially in view of down-gauge ability and pack stability, and good tensile properties.
  • puncture resistance and tear resistance are among the most important properties for collation shrink films in order to provide sufficient pack stability and to enable safe handling of the package.
  • LLDPE Low Density Polyethylene
  • TD transverse direction
  • LDPE low density polyethylene
  • LLDPE low density polyethylene
  • HDPE high density polyethylene
  • stiffness, toughness and bundling force also known as cold shrink force
  • WO 2017/055174 discloses a collation shrink film which is based on a coextruded film structure comprising two layers A and B each made from specific ethylene copolymers.
  • the present invention is based on the finding that such a film structure for a collation shrinkage film can be provided by a layered film structure comprising a core and two external layers which comprise specifically selected ethylene terpolymers in the core and at least one of the external layers.
  • the present invention therefore provides a layered film structure comprising, or consisting of, a core layer C and external layers E1 and E2 wherein core layer C comprises, or consists of, a multimodal ethylene terpolymer (I) having an MFR 5 of from 0.5 to 5 g/10min and a density of 0.928 to 0.940 g/cm 3 and wherein external layer(s) E1 and/or E2 comprise(s), or consist(s) of a multimodal ethylene terpolymer (II) having an MFR 2 of from 0.5 to 10 g/10min and a density of 0.920 to 0.935 g/cm 3 .
  • core layer C comprises, or consists of, a multimodal ethylene terpolymer (I) having an MFR 5 of from 0.5 to 5 g/10min and a density of 0.928 to 0.940 g/cm 3
  • external layer(s) E1 and/or E2 comprise(s), or consist(s) of a multimodal ethylene
  • this combination allows for an improved contraction force of the film structure so that in use as collation shrink film pack stability is enhanced, it has a better mechanical performance which offers better safety of the package (holding together the bottles; carrying the package by the film without break) and, simultaneously, excellent optical properties are obtained.
  • collation film thickness may be reduced, in particular for low thickness packaging ( ⁇ 50 micrometer).
  • multimodal ethylene terpolymer (I) is different from multimodal ethylene terpolymer (II).
  • the multimodal ethylene terpolymer (I) is bimodal and is either a terpolymer comprising, or consisting of
  • Such bimodal ethylene terpolymers are, for example, disclosed in WO 03/066698 .
  • definitions such as for the "modality" of a polymer
  • production methods for these ethylene terpolymers are concerned it is referred to WO 03/066698 .
  • all embodiments and preferred embodiments of such ethylene terpolymers as described in WO 03/066698 which have a density in the range of 0.928 to 0.940 g/cm 3 are also preferred embodiments of ethylene terpolymer (I) in the present application, whether or not explicitly described herein.
  • terpolymer (I) has a density in the range of 0.930 to 0.939 g/cm 3 .
  • the C 4 to C 12 alpha-olefin of the low molecular weight copolymer fraction is selected from the group of 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene.
  • the C 6 to C 12 alpha-olefin of the high molecular weight copolymer fraction is preferably selected from the group of 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene.
  • terpolymer (I) comprises, or consists of, a) a low molecular weight homopolymer of ethylene and b) a high molecular weight terpolymer of ethylene, 1-butene and a C 6 to C 12 alpha-olefin, preferably a high molecular weight terpolymer of ethylene, 1-butene and 1-hexene.
  • the weight average molecular weight of terpolymer (I) is preferably between 190,000 to 400,000 g/mol, more preferably between 200,000 to 300,000 g/mol.
  • the low molecular weight polymer fraction has a weight average molecular weight preferably of 4,500 to 55,000 g/mol, more preferably of 5,000 to 50,000 g/mol and the high molecular weight polymer has a weight average molecular weight preferably of 450,000 to 1,000,000 g/mol, more preferably of 500,000 to 1,000,000 g/mol.
  • Terpolymer (I) preferably has a melt flow rate MFR 5 of 0.6 to 4 g/10min, more preferably of 0.7 to 3 g/10min.
  • Terpolymer (I) preferably has a melt flow rate MFR 21 of 10 to 50 g/10min, more preferably of 15 to 45 g/10min.
  • the low molecular weight polymer fraction of terpolymer (I) preferably has a melt index MFR 2 of 200 to 800 g/10min, more preferably of 300 to 600 g/10min.
  • Terpolymer (I) preferably comprises 30 to 60 wt.%, more preferably 35 to 50 wt.% and most preferably 38 to 45 wt.% of the low molecular weight polymer fraction, the remainder being preferably the high molecular weight polymer fraction.
  • the overall comonomer content in the total polymer is preferably 1 to 7 % by mol, more preferably 2 to 6 % by mol.
  • the comonomer content is 0 to 2.5 % by mol, more preferably 0 to 2 % by mol.
  • the comonomer content preferably 2.5 to 11 % by mol, more preferably 3 to 10 % by mol.
  • terpolymer (I) comprises, or consists of, a) a low molecular weight homopolymer of ethylene and b) a high molecular weight terpolymer of ethylene, 1-butene and 1-hexene
  • the content of 1-butene in the final polymer is 1.0 to 2.0 % by weight and the content of 1-hexene is 4.0 to 6.0 % by weight.
  • terpolymer (I) has a viscosity ⁇ measured at 0.05 rad/s of 10,000 to 65,000 Pa ⁇ s, more preferably of 15,000 to 60,000 Pa ⁇ s, and most preferably of 20,000 to 55,000 Pa ⁇ s.
  • Preferred multimodal terpolymer (I) are also such commercially available as Borshape TM , such as BorShape TM FX1001 and BorShape TM FX1002, from Borealis.
  • FX1001 is a bimodal LLDPE terpolymer.
  • the low molecular weight fraction is a homopolymer of ethylene having an MFR 2 of 400 g/10 min, preferably produced in a loop reactor.
  • ethylene is co-polymerized with 1-butene and 1-hexene as comonomers.
  • the density of the final resin is 931 kg/m 3 and the MFR 5 is 0.85 g/10 min.
  • the split (LMW/HMW) is 39/61.
  • FX1001 has Mw/Mn of about 14 (from 13 to 15).
  • the content of 1-butene in the final polymer is 1.5 % by weight and the content of 1-hexene is 5.5 % by weight.
  • the viscosity ⁇ measured at 0.05 rad/s is 52000 (+/-5000) Pa ⁇ s.
  • FX1002 is a bimodal MDPE terpolymer.
  • the low molecular weight fraction is a homopolymer of ethylene having an MFR 2 of 400 g/10 min, preferably produced in a loop reactor.
  • ethylene is co-polymerized with 1-butene and 1-hexene as comonomers.
  • the density of the final resin is 937 kg/m 3
  • the MFR 5 is 2 g/10 min and the MFR 21 is 42 g/10 min.
  • the split (LMW/HMW) is 43/57.
  • FX1002 has Mw/Mn of about 12 (from 11 to 13).
  • the content of 1-butene in the final polymer is 1.5 % by weight and the content of 1-hexene is 4.5 % by weight.
  • the viscosity ⁇ measured at 0.05 rad/s is 23000 (+/-3000) Pa ⁇ s.
  • Multimodal ethylene terpolymer (II) of the layered film structure of the invention preferably comprises, or consists of, a multimodal polymer of ethylene with at least two different comonomers selected from alpha-olefins having from 4 to 10 carbon atoms, which has a ratio MFR 21 /MFR 2 of 13 to 30 and a MWD of 5 or less.
  • Such multimodal ethylene terpolymers are disclosed, for example, in WO 2016/083208 .
  • definitions such as for the "modality" of a polymer
  • production methods for these ethylene terpolymers are concerned it is referred to WO 2016/083208 .
  • all embodiments and preferred embodiments of such ethylene terpolymers as described in 2016/083208 which have a density in the range a density of 0.910 to 0.935 g/cm 3 are also preferred embodiments of ethylene terpolymer (II) in the present application, whether or not explicitly described herein.
  • Multimodal ethylene terpolymer (II) preferably has a MFR 2 in the range of from 0.5 to 2 g/10min, more preferably from 0.8 to 1.6 g/10min.
  • multimodal ethylene terpolymer (II) has a density of 0.920 to 0.933 g/cm 3 , more preferably of 0.923 to 0.930 g/cm 3 .
  • Multimodal ethylene terpolymer (II) preferably has a ratio MFR 21 /MFR 2 of 15 to 30, more preferably of 15 to 25.
  • the at least two alpha-olefin comonomers having from 4 to 10 carbon atoms of multimodal ethylene terpolymer (II) are preferably 1-butene and 1-hexene.
  • the total amount of comonomers present in the multimodal ethylene terpolymer (II) is of 0.5 to 10 mol%, preferably of 1.0 to 8 mol%, more preferably of 1.0 to 5 mol%, more preferably of 1.5 to 5.0 mol% and most preferably 1.1 to 3.0 mol%.
  • ethylene polymer component (A) has higher MFR 2 than ethylene polymer component (B).
  • the ethylene polymer component (A) has MFR 2 of 1 to 50 g/10 min, preferably of 1 to 40 g/10 min, more preferably of 1 to 30 g/10 min, more preferably of 2 to 20 g/10 min, more preferably of 2 to 15 g/10 min, and even more preferably of 2 to 10 g/10 min.
  • the ratio of the MFR 2 of ethylene polymer component (A) to the MFR 2 of the final multimodal ethylene terpolymer (II) preferably is 2 to 50, preferably 5 to 40, more preferably 10 to 30, more preferably 10 to 25, and still more preferably 15 to 25.
  • the ratio of the MFR 2 of ethylene polymer component (A) to the MFR 2 of the final multimodal terpolymer preferably is of 2 to 10.
  • ethylene polymer component (A) comprises a different comonomer than the ethylene polymer (B).
  • ethylene polymer component (A) has lower amount (mol%) of comonomer than ethylene polymer component (B), more preferably, the ratio of [the amount (mol%) of alpha-olefin comonomer having from 4 to 10 carbon atoms comonomer present in ethylene polymer component (A)] to [the amount (mol%) of at least two alpha-olefin comonomers having from 4 to 10 carbon atoms of the final multimodal polymer of ethylene (a)] is of 0.2 to 0.6, preferably of 0.25 to 0.5.
  • the alpha-olefin comonomer having from 4 to 10 carbon atoms of ethylene polymer component (A) is 1-butene and the alpha-olefin comonomer having from 4 to 10 carbon atoms of ethylene polymer component (B) is 1-hexene.
  • the amount of comonomer in component (A) is preferably from 0.15 to 1.0 mol%.
  • the amount of comonomer in component (B) is 1.5 to 3.5 mol%.
  • ethylene polymer component (A) has different, preferably higher, density than the density of the ethylene polymer component (B).
  • the density of the ethylene polymer component (A) is preferably 0.925 to 0.950 g/cm 3 , more preferably 0.930 to 0.945 g/cm 3 , and most preferably 0.935 to 0.940 g/cm 3 .
  • the multimodal ethylene terpolymer (II) comprises the ethylene polymer component (A) in an amount of 30 to 70 wt.%, preferably of 40 to 60 wt.%, more preferably of 35 to 50 wt.%, more preferably 40 to 50 wt.% and the ethylene polymer component (B) in an amount of 70 to 30 wt.%, preferably of 60 to 40 wt.%, more preferably of 50 to 65 wt.%, more preferably 50 to 60 wt.%, based on the total amount (100 wt.%) of the multimodal terpolymer (II).
  • multimodal ethylene terpolymer (II) consists of the ethylene polymer components (A) and (B) as the sole polymer components. Accordingly, the split between ethylene polymer component (A) to ethylene polymer component (B) is of (30 to 70):(70 to 30) preferably of (40 to 60):(60 to 40), more preferably of (35 to 50):(65 to 50), more preferably of (40 to 50):(50 to 60).
  • multimodal ethylene terpolymers are also such commercially available as Anteo TM from Borealis or Borouge having the properties as required herein.
  • core layer C comprises 30 wt.% or more of said multimodal ethylene terpolymer (I), more preferably 40 wt.% or more.
  • core layer C may comprise a low density polyethylene (LDPE).
  • LDPEs are well known in the art and are produced in high pressure process usually performed in a tubular reactor or an autoclave.
  • LDPEs and their production are, for example, described in WO 2017/055174 , page 9, line 29 to page 12, line 6, to which it is referred.
  • an LDPE is present in the core layer, it is used in an amount of 10 to 60 wt.%, more preferably in an amount of from 20 to 50 wt.%.
  • the LDPE used in layer C preferably has a density of 0.900 to 0.940 g/cm 3 , more preferably of 0.910 to 0.930 g/cm 3 , and most preferably of 0.915 to 0.925 g/cm 3 .
  • the LDPE used in layer C has a MFR 2 of 0.01 to 5 g/10min, more preferably of 0.05 to 3 g/10min, still more preferably 0.1 to 2 g/10 min, and most preferably 0.15 to 1 g/10min.
  • core layer C may also comprise a high density polyethylene (HDPE).
  • HDPEs are also well known in the art and are usually produced in polymerization processes using a catalyst.
  • an HDPE is present in the core layer, it is used in an amount of 2.5 to 20 wt.%, more preferably in an amount of from 5 to 15 wt.%.
  • the HDPE used in layer C preferably has a density of 0.950 to 0.970 g/cm 3 , more preferably of 0.955 to 0.965 g/cm 3 .
  • the HDPE used in layer C is an ethylene homopolymer.
  • the HDPE used in layer C has a MFR 2 of 0.05 to 10 g/10min, more preferably of 0.1 to 5 g/10min, still more preferably 0.2 to 3 g/10 min, and most preferably 0.4 to 1.5 g/10min.
  • core layer C consists of multimodal ethylene terpolymer (I), a LDPE and a HDPE as defined herein.
  • core layer C may also consist of 100 wt.% of multimodal ethylene terpolymer (I), in particular if the film structure comprises more than 3 layers.
  • External layer(s) E1 and E2 of the layered film structure of the invention may be made of the same polymer composition or of different polymer compositions in any one of the embodiments described herein for the polymer composition usable for layer E1 and/or E2.
  • E1 and E2 are made of the same polymer composition.
  • external layer(s) E1 and/or E2 comprise(s) 60 wt.% or more, more preferably comprise 70 wt.% or more of said multimodal ethylene terpolymer (II).
  • external layer E1 and/or E2 may comprise a low density polyethylene (LDPE).
  • LDPE low density polyethylene
  • an LDPE is present in external layer(s) E1 and/or E2, it is used in an amount of 5 to 35 wt.%, more preferably in an amount of from 10 to 30 wt.%, and still more preferably in an amount of from 15 to 25 wt.%.
  • the LDPE used in layer(s) E1 and/or E2 preferably has a density of 0.905 to 0.945 g/cm 3 , more preferably of 0.915 to 0.935 g/cm 3 , and most preferably of 0.918 to 0.927 g/cm 3 .
  • the LDPE used in layer(s) E1 and/or E2 has a MFR 2 of 0.05 to 10 g/10min, more preferably of 0.1 to 5 g/10min, still more preferably 0.2 to 3 g/10 min, and most preferably 0.4 to 1.5 g/10min.
  • external layer(s) E1 and/or E2 consist(s) of multimodal ethylene terpolymer (II) and a LDPE as defined herein.
  • the layered film structure according to the invention may consist of core layer C and external layers E1 and E2, but it may also further comprise one or more intermediate layer(s) I between core layer C and one of external layers E1 and/or E2, for example in a five layer film structure E1/I1/C/I2/E2.
  • intermediate layer(s) I preferably comprise, or consist of, a LDPE.
  • the LDPE used in layer(s) I preferably has a density of 0.905 to 0.945 g/cm 3 , more preferably of 0.915 to 0.935 g/cm 3 , and most preferably of 0.918 to 0.927 g/cm 3 .
  • the LDPE used in layer(s) I has a MFR 2 of 0.05 to 10 g/10min, more preferably of 0.1 to 5 g/10min, still more preferably 0.2 to 3 g/10 min, and most preferably 0.4 to 1.5 g/10min.
  • intermediate layer I may be made of the same or different material.
  • the layered film structure of the invention preferably has a thickness of 60 micrometer or lower, more preferably 50 micrometer or lower.
  • Core layer C in the layered film structure of the invention preferably has a thickness of 35 to 75 % of the total film structure thickness, more preferably of 40 to 70 % of the total film thickness.
  • the film structure of the invention consists of layers E1, C and E2 preferably core layer C has a thickness of 45 to 75 % of the total film structure thickness, more preferably of 50 to 70 % of the total film thickness.
  • the film structure of the invention consists of layers E1, I1, C, I2 and E2 preferably core layer C has a thickness of 35 to 65 % of the total film structure thickness, more preferably of 40 to 60 % of the total film thickness.
  • External layer(s) E1 and/or E2 has/have each preferably a thickness of 5 to 25 % of the total film structure thickness.
  • the film structure of the invention consists of layers E1, C and E2 preferably external layer(s) E1 and/or E2 has/have each a thickness of 10 to 25 % of the total film structure thickness, more preferably of 15 to 25 % of the total film thickness.
  • the film structure of the invention consists of layers E1, I1, C, I2 and E2 preferably external layers E1 and/or E2 has/have each a thickness of 5 to 20 % of the total film structure thickness, more preferably of 7.5 to 15 % of the total film thickness.
  • the layered film structure of the invention preferably has a contracting force in machine direction of 2.0 N or higher, more preferably of 2.1 N or higher.
  • the layered film structure of the invention has a shrinkage in oil at 165 °C in machine direction of 75% or higher.
  • the present invention also relates to a process for producing a layered film structure according to any one of the above described embodiments wherein the layers of the film structure are co-extruded.
  • the different polymer components in any of layers of the film are typically intimately mixed prior to layer formation, for example using a twin screw extruder, preferably a counter-rotating extruder. Then, the blends are converted into a coextruded film structure. Preferably, the blends are converted into a coextruded film structure on a blown-film line.
  • the blown coextrusion can be effected at a temperature in the range 160°C to 240°C, and cooled by blowing gas (generally air) at a temperature of 10 to 50°C to provide a frost line height of 1 to 8 times the diameter of the die.
  • blowing gas generally air
  • blow up ratio should generally be in the range 1.2 to 6, preferably 1.5 to 4.
  • the layered film structure of the invention may also have been subjected to a stretching step, wherein the film after its production is stretched in the machine direction (MDO). Stretching may be carried out by any conventional technique using any conventional stretching devices which are well known to those skilled in the art.
  • MDO machine direction
  • the present invention also relates to a collation shrink film comprising or consisting of a layered film structure according to any one of the embodiments as described herein, and to the use of said collation shrink film for wrapping of articles.
  • the melt flow rate is determined according to ISO 1133 and is indicated in g/10 min. The higher the melt flow rate, the lower the viscosity of the polymer.
  • the MFR is determined at 190 °C for polyethylene and at a loading of 2.16 kg (MFR 2 ), 5.00 kg (MFR 5 ) or 21.6 kg (MFR 21 ).
  • FRR flow rate ratio
  • Density of the polymer was measured according to ISO 1183-1:2019 (method A) on compression moulded specimen prepared according to EN ISO 1872-2 (Feb 2007) and is given in g/cm 3 .
  • the viscosity ⁇ at 0.05 rad/s was measured in parallel plate dynamic frequency sweep at 190 °C in a dynamic shear measurement which complies with ISO standards 6721-1 and 6721-10.
  • the measurements were performed on an Anton Paar MCR501 stress controlled rotational rheometer, equipped with a 25 mm parallel plate geometry. Measurements were undertaken on compression moulded plates, using nitrogen atmosphere and setting a strain within the linear viscoelastic regime. The oscillatory shear tests were done at 190 °C applying a frequency range between 0.01 and 600 rad/s and setting a gap of 1.3 mm.
  • MD machine direction
  • TD transverse direction
  • a rectangular test specimen having a longitudinal slit extending over half its length is subjected to a tensile test on the "trouser legs" formed by the slit.
  • the average force required to tear the specimen completely along its length is used to calculate the tear resistance of the material under test.
  • Gloss, clarity and haze as measures for the optical appearance of the films were determined according to ASTM D2457 (gloss) and ASTM D1003 (haze and clarity). Gloss was determined according to ISO 2813 (ASTM D2457) at an angle of 45°.
  • Seven layered film structures (three according to the invention and 4 comparative) were produced on an Alpine multilayer blown film equipment. All film structures were produced in the same processing conditions (BUR of 1:3, thickness 45 micrometres, die-gap of 1.5 mm, die diameter 300 mm, lower neck-height, internal bubble cooling, cooling air temperature 22 °C). The pressure and temperature process conditions are given separately in Table 3.
  • Table 1 The polymers used for making the layered film structures of the invention and of the comparative examples are given in Table 1 below.
  • Table 1 Resin name Producer Type MFR 190°C/2.16kg (g/10min) Density (kg/m 3 ) Slip & antiblock MDPE1 Bimodal terpolymer MDPE 1.3 927 No FX1001 Borealis terpolymer LLDPE 0.85* 931 No FX1002 Borealis terpolymer LLDPE 2* 937 No Supertough 32ST05 Total metallocene C2-C6 copolymer 0.5 932 No Enable 4002MC ExxonMobil Metallocene C2-C6 copolymer MDPE 0.25 940 No Enable 2703CH ExxonMobil Metallocene C2-C6 copolymer 0.30 927 No Enable 3505CH ExxonMobil Metallocene C2-C6 copolymer MDPE 0.50 935 No HTA 108 ExxonMobil homo HDPE 0.7 9
  • composition and structure of the layered films produced are given in Table 2.
  • the thickness of the layers is given in % of the total thickness of the film. All films produced had a total thickness of 45 micrometer.
  • "E” means external layer
  • “C” means core layer
  • "I” means internal layer. The external and internal layers of the films produced had each the same composition and thickness.
  • Table 2 Exam ple Layer structure Total density Core Layer Composition: polymers/amount wt.% Core layer thickness; density External Layer Composition: Polymers/amou nt wt.% External layers thicknes s; density Internal layer Compos ition Internal layers thickne ss; density IE 1 E/C/E 0.929 FX1002 46 60%; MDPE1 80 20 %; FT3200 44 0.932 FT5236 20 0.926 HTA108 10 IE2 E/C/E 0.929 FX1001 60 60%; MDPE1 80 20%; FT3200 30 0.930 FT5236 20 0.926 HTA108 10 IE3 E/I/C/I/E 0.931 FX1002 100 50%; MDPE1 80 10%; FT5236 15%; 0.937 FT5236 20 0.926 0.923 CE1 E/C/E 0.930 Enable4002MC 44 60%; MDPE1 80 20%; FT3200 46 0.933 FT5236 20 0.926 HTA108 10 CE
  • the shrinking force is higher in the film structures according to the invention ( ⁇ 2.2 to 2.4 N) vs. in the film structures of the comparative examples ( ⁇ 1.9 N).
  • High shrinkage force is favourable for stronger holding of the goods wrapped with the film.
  • shrinkage in the transverse direction ( Figure 2 ) is also on average at a higher level ( ⁇ 78% vs. 75%).

Landscapes

  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
EP20208648.4A 2020-11-19 2020-11-19 Polyethylenfolienstrukturen für sicherere feinschrumpffolien Pending EP4000924A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP20208648.4A EP4000924A1 (de) 2020-11-19 2020-11-19 Polyethylenfolienstrukturen für sicherere feinschrumpffolien
CN202180088704.7A CN116710280A (zh) 2020-11-19 2021-11-18 用于更安全的整理收缩膜的聚乙烯膜结构
IL303039A IL303039A (en) 2020-11-19 2021-11-18 Polyethylene sheet structures for safer collection-shrink sheets
PCT/EP2021/082082 WO2022106507A1 (en) 2020-11-19 2021-11-18 Polyethylene film structures for safer collation-shrink films
TW110142915A TW202241711A (zh) 2020-11-19 2021-11-18 用於更安全的集束收縮膜的聚乙烯膜結構及其製程、集束收縮膜及其用途

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20208648.4A EP4000924A1 (de) 2020-11-19 2020-11-19 Polyethylenfolienstrukturen für sicherere feinschrumpffolien

Publications (1)

Publication Number Publication Date
EP4000924A1 true EP4000924A1 (de) 2022-05-25

Family

ID=73497612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20208648.4A Pending EP4000924A1 (de) 2020-11-19 2020-11-19 Polyethylenfolienstrukturen für sicherere feinschrumpffolien

Country Status (5)

Country Link
EP (1) EP4000924A1 (de)
CN (1) CN116710280A (de)
IL (1) IL303039A (de)
TW (1) TW202241711A (de)
WO (1) WO2022106507A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4296298A1 (de) * 2022-06-22 2023-12-27 Abu Dhabi Polymers Co. Ltd (Borouge) Llc. Verbesserte gewächshausfolien mit morphologiegesteuerter verstärkung und differenzieller streuung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003066698A1 (en) 2002-02-04 2003-08-14 Borealis Technology Oy Film with high impact strength
EP2415598A1 (de) * 2010-08-06 2012-02-08 Borealis AG Mehrschichtige Folie
US20160083208A1 (en) 2014-08-29 2016-03-24 Lexmark International, Inc. Self-Aligning Low Profile Spring-Biased Media Feed Roll Assembly for an Imaging Device
WO2016083208A1 (en) 2014-11-26 2016-06-02 Borealis Ag Polyethylene composition for a film layer
WO2017055174A1 (en) 2015-10-02 2017-04-06 Borealis Ag Coextruded structures for collation shrink films
EP3335874A1 (de) * 2016-12-15 2018-06-20 Borealis AG Biaxial ausgerichtete artikel mit multimodalem polyethylenpolymer
WO2020136166A1 (en) * 2018-12-28 2020-07-02 Borealis Ag Multilayer film
WO2020207940A1 (en) * 2019-04-09 2020-10-15 Borealis Ag Collation shrink film

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111315567B (zh) 2017-10-24 2022-02-25 博里利斯股份公司 多层聚合物膜

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003066698A1 (en) 2002-02-04 2003-08-14 Borealis Technology Oy Film with high impact strength
EP2415598A1 (de) * 2010-08-06 2012-02-08 Borealis AG Mehrschichtige Folie
US20160083208A1 (en) 2014-08-29 2016-03-24 Lexmark International, Inc. Self-Aligning Low Profile Spring-Biased Media Feed Roll Assembly for an Imaging Device
WO2016083208A1 (en) 2014-11-26 2016-06-02 Borealis Ag Polyethylene composition for a film layer
WO2017055174A1 (en) 2015-10-02 2017-04-06 Borealis Ag Coextruded structures for collation shrink films
EP3335874A1 (de) * 2016-12-15 2018-06-20 Borealis AG Biaxial ausgerichtete artikel mit multimodalem polyethylenpolymer
WO2020136166A1 (en) * 2018-12-28 2020-07-02 Borealis Ag Multilayer film
WO2020207940A1 (en) * 2019-04-09 2020-10-15 Borealis Ag Collation shrink film

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4296298A1 (de) * 2022-06-22 2023-12-27 Abu Dhabi Polymers Co. Ltd (Borouge) Llc. Verbesserte gewächshausfolien mit morphologiegesteuerter verstärkung und differenzieller streuung
WO2023247492A1 (en) * 2022-06-22 2023-12-28 Abu Dhabi Polymers Co. Ltd (Borouge) L.L.C Enhanced greenhouse films with morphology driven reinforcement and differential scattering

Also Published As

Publication number Publication date
WO2022106507A1 (en) 2022-05-27
TW202241711A (zh) 2022-11-01
IL303039A (en) 2023-07-01
CN116710280A (zh) 2023-09-05

Similar Documents

Publication Publication Date Title
EP2875948B1 (de) In Maschinenrichtung ausgerichtete Folie
EP2698251B1 (de) Folien
EP2653392B1 (de) Schrumpffolie
US11993060B2 (en) Multilayer film
EP2653391A1 (de) Schrumpffolien für eine Behältergruppe
EP1551891B1 (de) Schrumpffolie
JP2022554151A (ja) 二軸配向ｍｄｐｅフィルム
EP4000924A1 (de) Polyethylenfolienstrukturen für sicherere feinschrumpffolien
AU2003248954B2 (en) Schrink film
EP4201674A1 (de) Mehrschichtenfilmstruktur enthaltend multimodal ethylen-terpolymere und recyceltes ldpe für feinschrumpffolien
EP4000920A1 (de) Polyethylenfolienstrukturen für sicherere feinschrumpffolien
EP4122705B1 (de) Polyethylenfolie für hochgeschwindigkeitsdruck geeignet für nachhaltige verpackungen
EP4452641A1 (de) Mehrschichtige folienstruktur mit multimodalen ethylencopolymeren und recyceltem ldpe für feinschrumpffolien
WO2023117419A1 (en) Multi-layer film structure comprising multimodal ethylene copolymers and recycled ldpe for collation-shrink films
EP4183572A1 (de) Polyethylenlaminate für nachhaltige verpackungen
EP4011618A1 (de) Geschichteter polyethylenfilm für verpackungsmaterial
EP4011608A1 (de) Geschichteter polyethylenfilm für verpackungsmaterial
WO2024013378A1 (en) Multilayer uniaxially oriented film
CN118475472A (zh) 优异密封性能的聚乙烯膜

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20221121

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR